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You can now search for the average salary of bearers of 1.3 million+ surnames, across 11 nations/territories.
Lists of the highest and lowest earners in a country can be viewed here for the United States. There are links to navigate to other countries on the left (or from the hidden 'side menu' on mobile).
To find your surname, search and go down to the demographics section.
I will be adding a few more countries at a later date. Among them Montenegro and Peru. But next to go online will be political affiliation by surname (US, Uruguay) and religion by surname (about 10-20 countries, including The US and Lebanon).
Mine (US):
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